1) z-order problem on webkit, with 3D transform
This mask thing could not work properly because In iPhone's safari when a object is 3D transformed , z-order does not work properly. I worked around it by making one half of page to transparent.

2) Touch Events of iPhone
Touch events on iPhone have some serious problem, i encountered weird problem with event propagation.

Feel free to ask any question about the Demo, Please let me know if You have better solution to emulate Flipboard UI.